A polyolefin and ceramic battery separator for non-aqueous...

H - Electricity – 01 – M

Patent

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H01M 2/16 (2006.01)

Patent

CA 2751752

A ceramic microporous polyolefin battery separator membrane, high in air permeability, low in shrinkage and improved temperature resistance addresses the safety requirements of lithium ion batteries. The separators made by the current invention consists of one or more polyolefin polymers and kaolin fillers comprised of aluminum oxide and silicon oxide. The membranes of current invention have a thickness of 5-200 microns, air permeability of 1- 200 sec/10cc (Gurley seconds), and average pore diameter of less than 1 micron.

L'invention concerne une membrane séparatrice de batterie en céramique et polyoléfine microporeuse qui répond aux spécifications de sécurité des batteries aux ions de lithium par sa perméabilité à l'air élevée, sa faible contraction et sa résistance thermique améliorée. La présente invention a pour objet un ou plusieurs polymères polyoléfiniques et charges kaoliniques composées d'oxyde d'aluminium et d'oxyde de silicium. La membrane selon la présente invention présente une épaisseur de 5 à 200 microns, une perméabilité à l'air de 1 à 200 s/10 cm3 (secondes Gurley) et un diamètre moyen des pores inférieur à 1 micron.

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